a) Data Definition language (DDL)
   Affect of SCHEMA
   CREATE, DROP, ALTER, RENAME, TRUNCATE

b) Data Manipulation language (DML)
   Affect of TUPLES
   SELECT, INSERT, UPDATE, DELETE
c) Data Control Language (DCL) [permission]
   GRANT, REVOKE
d) Transaction Control Language (TCL)
   ROLLBACK, COMMIT, SAVEPOINT, BEGIN
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Common terms :-

a) tuples :
   Record of any table's row

b) entity :
   is Table Name

c) attribute :
   is column name of table

d) Schema :
   overall structure of DB contain:
   1) DB name
   2) Table Name
   3) Column Name
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TRUNCATE :
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Step-1) Take TMP backup of structure of Table.
Step-2) DROP that table.
Step-3) CRAETE that table with the help of Step-1
        (TMP structure of table already saved)
Step-4) There is no step 4

TRUNCATE = DROP + CREATE
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